def add_hierarchical_feats(transactions,transaction_type='historical'):
    data = transactions
    aggs = ['mean','min','max','var']
    pairs = [['state_id','city_id'],['subsector_id','merchant_category_id']]
    for agg in aggs:
        for pair in pairs:
            data['{}_{}_{}_{}'.format(transaction_type,pair[0],pair[1],agg)] = data.groupby(pair)['purchase_amount'].transform(agg).fillna(0)
    return data